Hydraulic liquid pump



April 20, 1954 E. c. HALL HYDRAULIC LIQUID PUMP 2 sheets-sheet 1 FiledSept. 29, 1950 f T s .usw Nw m A M l uw m H my @W l. m s l l sm\ ,www UQ\ H Q A Y h Q B, wf

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aus* C. HALL Patented Apr. 20, 1954 UNITED STATES PATENT GFFICEHYDRAULIC LIQUID PUMP Application SeptemberS, 1950, Serial No. 187,594

(Cl. S- 44) 2 Claims.

The present invention relates to an hydraulic liquid pump and itconsists in the combinations, constructions and arrangements of partsherein described and claimed.

Generally there is provided an hydraulically operated liquid pump whichis particularly adapted to deep well operations and which consistsessentially of a motor comprising a pair of pistons mounted in cylindersand adapted to pump iiuid through a pair of lines to a pump which, inturn, consists of a pair of cylinders each connected with one end of acomparatively large cylinder and each having therein a piston whichpistons are interconnected with a piston rod upon which is mounted arelatively large piston which reciprccates in the comparatively largecylinder. The apparatus is so arranged that pressure alternately appliedto the two lines will cause a reciprocation of the pistons in the motorto thus upon each stroke force an excess of fluid taken in by the largecylinder through the line which is inactive at the moment and throughcertain valve connections in the motor send the excess of uid to astorage tank.

, It is accordingly an object of the invention to provide an apparatusof the character set forth which is relatively simple in construction,easy to operate and yet effective and eiicient in use.

A further object of the invention is the provision of an apparatus ofthe character set forth which is particularly adaptable to the pumpingof fluids from deep wells and other places remote from a motor forming apart of the invention.

Another object of the invention is the provision of a novel motorforming a part of the invention.

Another object of the invention is the provision of a novel pump forminga part of the invention.

. Other and further objects of the invention will become apparent from areading of the following specification taken in conjunction with thedrawings, in which:

; Figure 1 is an elevational view, partly broken away and partly insection, of an embodiment of the invention,

- Figure 2 is an enlarged fragmentary sectional view, partly in section,of the motor portion of the apparatus,

Figure 3 is an enlarged sectional view of a portion of the pump portionof the apparatus, and

Figure 4 is a fragmentary reduced elevational view, partly in section,illustrating a modified pipe line construction utilized in theinvention.

Referring more particularly to the drawings, -there is shown therein abell crank lever I0 which 2 is pivoted at II and pivotally connected atone end, as indicated at I2, to a shaft I3. The other end of the bellcrank lever I0 is connected to some suitable source of power (not shown)for oscillating the same to provide reciprocal movement for the shaftI3.

The shaft I3 extends into cylinders I4 and I5 and has mounted at eitherend a piston I6 and I'I which are respectively reciprocal in thecylinders I4 and I5. An aligning arm I8 is shown as interconnecting theouter sides of the cylinders Ill and I5. The cylinder I4 communicateswith a casing I9 while the cylinder I5 communicates with a casing ISa.The casing I9 is provided with an extension 2li which is connected by apipe 2I with a tank 22 and the casing Ia is provided with an extension20a which is connected by means of a pipe 2 Ia with the storage tank 22.A passageway 23 interconnects the interior of the casing I9 and theextension 20 and a passageway 23a likewise connects the interior of thecasing I 9a and the extension 20a. A cylindrical passageway 24interconnects the extension 20 and the interior of the casing I9 and isprovided with a seat 25 at that end thereof adjacent the extension 20and a stop member 26 at its other end, A piston 2l is reciprocable inthe passageway 24. A like passageway 24a, seat 25a, stop member 26a andpiston 21a are provided in the members I9@ and 20a.

The passageway 23 is governed by a normally closed valve 23 which isprovided with a spring 29 for maintaining the same in a seatedcondition. A like valve 28a and spring 29a are provided in the housingI9a for governing the passage 23a.

The housing I9 is provided with a compartment 30 having an opening 3|connecting the same with the interior of the casing I9 which opening SIis provided with a valve 32 which is maintained normally in a seatedposition by means of a spring 33. The casing lila is likewise providedwith a compartment 30a having an opening 3 Ia, a valve 32a and a spring33a.

The compartment 30 communicates with the passageway 24 by means of anopening 34 and the compartment 30a communicates with the passageway 24aby means of an opening 34a. A pipe 35 interconnects the storage tank 22with a cylindrical extension 36 of the casing I8 and a like pipe 35ainterconnects the storage tank 22a with a like cylindrical extension36a, for the casing I9a. A cylindrical pressure relief valve 3l is urgedby a spring 38 to normally close the pipe 35 from communication with theinterior of the extension 3 and like elements 31a and 38a are providedin the extension 36a.

A pump structure is best illustrated in Figure l and consists of arelatively large cylinder 39 having in communication therewith at eitherend thereof a relatively smaller cylinder i0 and 46a. A pipe 4iinterconnects the outer end of the cylinder 49 with the compartment 3G,and a pipe ela interconnects the cylinder 43a and the compartment 36a. Apiston i2 is aixed to a piston rod 43 at one end thereof and isreciprocable in the cylinder Ale. At the other end of the piston rod 43there is affixed a piston 42a which is reciprocal in the cylinder 'filmand, centrally axed to the rod d3, there is a piston 44 which isreciprocal in the cylinder 39.

In the end wall of the cylinder 39 adjacent the piston d2 there isprovided a valve i5 which is inwardly opening and which is maintainednormally closed by means of a spring 5. In the end wall of the piston39a adjacent the cylinder 4ta a like inwardly opening valve 45a isprovided and has a spring 43a for normally maintaining the same inclosed position.

The piston rod 43 is provided with a longitudinal passageway 4l, asshown in Figure 3, which passageway communicates with an enlarged hollowmember t3' which extends through the piston 42 and with an enlargedhollow member 48a which extends through the piston 42a. The member 43 isprovided with a plurality oi openings is which communicate with theinterior of the cylinder 39 and the member lita is provided with aplurality of openings 59a which communicate with the interior 39.

The outer end of the member d3 is provided with a valve t which isnormally closed and the member d8a is provided with a like valve 50cwhich is likewise maintained normally closed by means of a spring ta, itbeing understood that a like spring is provided for the valve 50.

In operation, it will be apparent that as power is applied to the leverI!) to reciprocate the shaft i3 first in a direction to the left asviewed in Figure 2, that fluid within the casing i9 will be compressedthereby insuring the closing of the valve 2S and at the same time movingthe cylinder valve 2 to the left to seat upon the element 25. At thesame time, the valve 32 will be opened and fluid will be forced throughthe pipe 4| and will cause the closing of the valve 5U upon its entranceinto the cylinder d. This action will move the piston i2 to the left asviewed in Figure 1 and consequently will movethe piston 44 to the leftin the cylinder 33 and the piston 42a to the left in the cylinder ella.As this action occurs the valve i5 will be opened against the action ofthe spring 45 thereby drawing fluid into the cylinder 39. This actionwill also cause the excess fluid from the left side of the piston 44 inthe cylinder 35 to pass through the openings !lgd and thence into thepipe da through the valve 5a. This excess fluid will then enter thecasing lea closing the valve 32a and moving the piston-like valve A21ato the left as, viewed in Figure 2 thus allowing fluid to pass throughthe passageway 24a into the extension 20a and thence through thepassageway 23a and through the valve 28a. Some of such fluid will llinto the cylinder i5 as the piston moves to the left. However, theexcess fluid which is not needed to lill in behind the piston IT as itso moves to the left will pass through the pipe Zia to the storage tank22.

Upon a movement to the right of the shaft I3 upon its next stroke, thereverse of the action above described will take place and the excessfluid Will pass through the pipe 2| into the storage tank 22. Thus itwill be seen that upon each stroke of the shaft I3 in either direction acertain amount of fluid will be delivered to the tank '22. If, at anytime movement of the shaft I3 and its attached pistons i6 and I1 shouldget out of synchronization with the rod 43 and its attached pistons, anyexcess of fluid will be delivered to the storage tank 22 through eitherthe pipe 35 or the pipe 35a, the relief valve 3'! and/or 31a functioningto allow such passage of excess fluid.

In the form of the invention illustrated in Figure 4, the pipe da, isshown as being relatively larger than shown in Figure 1, for example,and the pipe il is shown as mounted concentrically therein for thegreater part of its length to conserve space, it being understood,however, that the pipes li! and Illa have identical connections with thecylinders dil and 43a and with the casings I9 and lila as is shown inFigure l.

While but certain forms of the invention have been shown and describedherein, it will be readily apparent to those skilled in the art thatmany minor modifications may lie-made without departing from the spiritof the invention or the scope of the appended claims.

What is claimed is:

l. An apparatus of the character described comprising a motor having apair of cylinders, a piston in each of said cylinders, a shaftinterconnecting said pistons, and a pump having a relatively largecylinder, a relatively small cylinder interiorly connected with saidlarge cylinder at each end thereof, a piston in each of said smallcylinders and a piston in said large cylinder and a piston rodinterconnecting the pistons in said large and small cylinders, a pipeinterconnecting one cylinder of the motor with one of the smallercylinders of 'the pump, a pipe interconnecting the other cylinder of themotor with the other smaller cylinder of the pump, an inlet valve ateach end of the larger cylinder, a storage tank, a pipe connecting eachof the cylinders of the motor with said tank, and means for deliveringfiuid drawn into said pump to said tank, said means including apassageway through the 'rod in said pump, means forming a perforatedcompartment connected to said rod and vconnected adjacent the inner sideof each of the smaller pistons in said pump, said smaller pistons eachhaving a centrally disposed opening therethrough, and a spring-closedvalve upon the outer side of each of said smaller pistons forcontrollinglthe passages in such smaller pistons.

2. An apparatus of the character described comprising a motor having apair of cylinders, a.

one cylinder of the motor with one of the smaller ycylinders of thepump, a pipe interconnecting the other cylinder of the motor with theother smaller cylinder of the pump, an inlet valve'at each end of thelarger cylinder, a storage tank, a pipe connecting each of the cylindersof the motor with said tank, means for delivering Iiuid drawn into saidpump to said tank, atpair of reliepipe's interconnecting said motor andsaid tank, and a pressure-relief valve in each of said relief pipes,said means including a passage through the rod in said pump, aperforated compartment in said rod adjacent the inner side of each ofthe smaller pistons in said pump, said smaller pistons each having acentrally disposed opening therethrough, and a spring-closed valve uponthe outer side of each of said smaller pistons for controlling thepassages in such smaller pistons.

References Cited in the le of this patent UNITED STATES PATENTS 5 NumberName Date Rocklifl et a1 Sept. 20, 1892 Corey et al Apr. 7, 1925 BowlingAug, 18, 1936 Richards et al June 20, 1939 OHarah Nov, 16, 1948

